I suggest you ...

Add ability to delete seen items from Inbox

I would like to be able to delete items from the Inbox once they've been seen or taken care of. Would be easier to organize the inbox. Perhaps even an option to "flag" an item to be taken care of later, and then an option to delete it from the inbox once it's been taken care of.

We’re delighted to announce Oktoposts’ new UI includes an inbox where you can Assign, dismiss and delete items from your Inbox!
This is currently rolling out and you should have access within the next few weeks.